Use a direct include of strings headers in chrome/browser/ui/a*/.

chrome/browser/ui/app_list/search/tokenized_string.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/range/range.h"
 
 namespace app_list {
 
 // TokenizedString takes a string and breaks it down into token words. It
 // first breaks using BreakIterator to get all the words. Then it breaks
 // the words again at camel case boundaries and alpha/number boundaries.
 class TokenizedString {
  public:
   typedef std::vector<string16> Tokens;
@@ skipping 15 matching lines @@
   // Broken down tokens and the index mapping of tokens in original string.
   Tokens tokens_;
   Mappings mappings_;
 
   DISALLOW_COPY_AND_ASSIGN(TokenizedString);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_H_